7.50 Figure P7.50 shows the circuit of an amplifier fed with a signal source vsig with a source resistance Rsig. The bias circuitry is not shown. Replace the BJT with its hybrid-π equivalent circuit of Fig. 7.24(a). Find the input resistance R in ≡ vπ/ib, the voltage transmission from source to amplifier input, vπ/vsig, and the voltage gain from base to collector, v o/vπ. Use these to show that the overall voltage gain vo/vsig is given by

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images - 7.50 Figure P7.50 shows the circuit of an amplifier fed with a signal source vsig with a source resistance Rsig. The bias circuitry is not shown. Replace the BJT with its hybrid-π equivalent circuit of Fig. 7.24(a). Find the input resistance R in ≡ vπ/ib, the voltage transmission from source to amplifier input, vπ/vsig, and the voltage gain from base to collector, v o/vπ. Use these to show that the overall voltage gain vo/vsig is given by

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